C# 0 The Complete Reference

The Boolean Structure

The

Boolean

 structure supports the 

bool

 data type. The methods defined by 

Boolean

 are 

shown in Table 21-10. It defines these fields:

public static readonly string FalseString

public static readonly string TrueString

These contain the human-readable forms of 

true

 and 

false

. For example, if you output 

FalseString

 using a call to 

WriteLine( )

, the string “False” is displayed.

Boolean

 implements the following interfaces: 

IComparable

,

IComparable

,

IConvertible

, and 

IEquatable

.

Method

Meaning

public int CompareTo(bool 

v

)

Compares the value of the invoking object with that of 

v.

Returns zero if the values are equal. Returns a negative 

value if the invoking object is false and 

v

 is true. Returns 

a positive value if the invoking object is true and 

v

 is false. 

public int CompareTo(object 

v

)

Compares the value of the invoking object with that of 

v.

Returns zero if the values are equal. Returns a negative 

value if the invoking object is false and 

v

 is true. Returns 

a positive value if the invoking object is true and 

v

 is false. 

public bool Equals(bool 

v

)

Returns true if the value of the invoking object equals the 

value of 

v. 

public override bool Equals(object 

v

)

Returns true if the value of the invoking object equals the 

value of 

v.

public override int GetHashCode( )

Returns the hash code for the invoking object.

public TypeCode GetTypeCode( )

Returns the 

TypeCode

 enumeration value for 

Boolean

,

which is 

TypeCode.Boolean

.

public static bool Parse(string 

str

)

Returns the 

bool

 equivalent of the string in 

str.

 If the string 

is neither 

Boolean.TrueString

 nor 

Boolean.FalseString

, a 

FormatException

 is thrown. However, case differences are 

ignored.

public override string ToString( )

Returns the string representation of the value of the invoking 

object, which will be either 

TrueString

 or 

FalseString

.

public string

     ToString(IFormatProvider 

fmtpvdr

)

Returns the string representation of the value of the 

invoking object, which will be either 

TrueString

 or 

FalseString

. The 

fmtpvdr

parameter is ignored.

T

ABLE

 21-10 

Methods Defi ned by 

Boolean

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